CI: fix nixos manual should rebuild on 'lib/**' changes

[hsjobeki]

Fix for the problem that caused: #391017

nixos-manual must also be rebuilt for changes in lib.

This is perhaps one of the best integration tests for evalModules, because it evaluates the complete zoo of 40k options.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[nixpkgs-ci]

Git push to origin failed for release-24.11 with exitcode 1

[Mic92]

@hsjobeki could you open a backport PR for this change?

[nixpkgs-ci]

Git push to origin failed for staging-24.11 with exitcode 1

[nixpkgs-ci]

Git push to origin failed for release-24.11 with exitcode 1